What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
It depends on the login info you are sending, are they fixed and does not dynamically changed?
Here's an autoresponder where I edited the email body/template:
The autoresponder will only be sent IF the form is successfully completed, which means if you have a Paypal integration on it, they should complete the payment before seeing the thank you confirmation.
If in case the user did not complete the payment for any reason (accidentally closed the browser or abandoned the payment gateway on purpose), then it will be marked as "Incomplete Payment", it will be listed in your "Incomplete Payment" submissions, notifications and autoresponders will not be triggered. Unless you manually click the "Complete" button on them. To learn more about incomplete payments, please follow this guide: http://www.jotform.com/help/135-How-to-View-Incomplete-Payments
Do let us know if you need further assistance on this.